[34537] hooked `wp_new_comment_notify_postauthor()` to the
'wp_set_comment_status' when a comment had been approved. When performing
multiple actions on a comment in the same request (as happens in
`Tests_Ajax_DeleteComment::test_ajax_trash_double_action()`, and may happen
sometimes in real life too), and when one of those actions involves deleting
the comment, the `$comment_ID` passed to `wp_new_comment_notify_postauthor()`
can correspond to an already-deleted comment. The `comment_status` check should
account for this possibility.
See #14078.
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